IGLON5 and cerebellar ataxia: It is noteworthy that all patients with anti-IgLON5 disease fulfilled at least the diagnostic criteria suggestive of PSP (2 suggestive of PSP/2 probable PSP) at the time of VOG and 2/4 patients with anti-IgLON5 disease presented with gait instability and ataxia but without typical parkinsonian features.